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LGEOTECHNICAL <br /> L NEIL O. ANDERSON ENVIRONMENTAL <br /> "004 AN D ASSOCIATES INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> L February 21,2007 <br /> NOA Project Number. E07015A <br /> L PART II: NITRATE LOADING STUDY <br /> L SJC APPLICATION NUMBER PA-06-617 (SA) <br /> 9948 SOUTH HARLAN ROAD <br /> L FRENCH CAMP, CALIFORNIA <br /> LINTRODUCTION <br /> Our office was contracted by Mike Smith Engineering of Lodi to conduct a Nitrate Loading Study <br /> L (NIS) for the property at 9948 South Harlan Road, French Camp, California. Please refer to the <br /> relevant sections of the attached Soil Suitability Study (SSS) for introductory project details. <br /> To expedite San Joaquin County Environmental Health Department(EHD) review, the <br /> formatting of this report has been designed to follow, to the greatest degree possible,the <br /> structure of the EHD's Nitrate Loading Study Requirements Checklist, dated July 14,2003. <br /> Because of concern regarding nitrate leaching into ground water from septic systems,a nitrate <br /> loading analysis was required by the EHD for the proposed development to measure the potential <br /> L concentration of percolating effluent and rain fall over the long term. Where percolating effluent <br /> leaches into the ground,ground water quality may be impacted to some degree should the effluent <br /> reach ground water. <br /> L <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992),which provides a convenient <br /> ` and simplified method to estimate long-term ground-water nitrate impacts on an area-wide basis. <br /> Hantzsche and Finnemore found that over a long period of time,water quality in the upper <br /> L saturated ground-water zone closely approximates the quality of percolating recharge waters.They <br /> believe that their method is a good planning tool and provides useful information to planners and <br /> local officials but with some real limitations. In their article published in Ground Water, Hantzsche <br /> Land Finnemore mention that"...the equation ignores dispersion,lateral flow,and mixing with <br /> 2 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> LENVIRONMENTAL DIVISION 902 Industrial Way,Lo4 Califomia 95240 ■209.367.3701 0 209.369.4228 ■w .noandff o xom <br />